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32. 发明授权

US5999828A Multi-user wireless telephone having dual echo cancellers 失效
标题翻译：具有双重回声消除器的多用户无线电话
公开(公告)号：US5999828A
公开(公告)日：1999-12-07
申请号：US820934
申请日：1997-03-19
申请人： Gilbert C. Sih , Samir Kumar Gupta
发明人： Gilbert C. Sih , Samir Kumar Gupta
IPC分类号： H04M1/58 , H04B3/23 , H04M1/723 , H04M9/08 , H04W88/06 , H04Q7/20
CPC分类号： H04M9/082 , H04B3/23
摘要： A method and apparatus for canceling both earseal and hybrid echo in a Wireless Local Loop telephone system is disclosed. The present invention operates within a subscriber station having a plurality of telephone inputs, one of which is a dedicated handset and at least one other input being a standard analog telephone. During a conference call between a far end speaker and two near end speakers, the far end speaker may hear an echo of his own voice due to an earseal echo generated by the dedicated handset and a hybrid echo generated by a 4-to-2 wire hybrid interface within the subscriber station. In accordance with the present invention, two distinct echo cancellers are used in the subscriber station to reduce the two types of echo. A first echo canceller is optimized to remove the earseal echo generated at the dedicated handset while a second echo canceller is optimized to remove the hybrid echo generated at the 4-to-2 wire hybrid. The two echo cancellers operate independently such that neither echo canceller need adapt its filter coefficients when a change in the echo channel characteristics occur, such as when a speaker hangs up or another speaker joins the conversation.
摘要翻译：公开了一种在无线本地环路电话系统中消除耳塞和混合回波的方法和装置。本发明在具有多个电话输入的用户站中操作，其中一个是专用手持机，并且至少一个其它输入是标准模拟电话。在远端扬声器和两个近端扬声器之间的电话会议期间，远端扬声器可能由于专用手机产生的耳塞回声和由4对2线产生的混合回声而听到自己的声音的回声用户站内的混合接口。根据本发明，在用户站中使用两个不同的回波消除器来减少两种类型的回波。优化第一回波消除器以消除在专用手持机处产生的耳塞回声，而第二回波消除器被优化以去除在4对2线混合电路产生的混合回波。两个回波消除器独立地操作，使得当回波信道特性发生变化时，例如当扬声器挂起或者另一个扬声器加入对话时，回波消除器都不需要调整其滤波器系数。

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